Rod Tube Liners are available plain or with pockets to hold your rod sections. 

These are great to finish off your tube by lining the inside of the tube.  Makes the tube look better and protects your rod from rubbing against the tubing. 

Standard Liners: For lining the inside of the tube to protect your rod from rubbing on the side of the tube. 

Divided Pocket Liners: For additional protection from your rod sections rubbing together.  Divided Pocket Liners are available in 2 piece or Multi Piece (for 3, 4 or 5 piece rods)  to keep your rod sections from touching as well.